Cisco ASR 903 Hardware Installation Guide

DB-9 Connector Pinouts
The table below summarizes the pinouts for each serial interface type when using a DB-9 connector.
Table 27: DB-9 Pin-outs
IRIG-BRS-485DescriptionDirectionStandard DB-9Pin
NCNCUnusedOutputNC1
NCNCReceiveInputRxD2
IRIG-B (RS232)IRIG-B (RS232)TransmitOutputTxD3
IRIG-B-
(RS485)
TxD-DTROutputDTR4
GNDGNDGNDGND5
NCRxDDSRInputDSR6
IRIG-B+TxD+RTSOutputRTS7
NCRxD+ (CTSInputCTS8
NCNCUnused or RingNC/GND9
Twisted pairs are 2-5, 6-8, 4-7.Note
The X.21, V.35, RS-485, EIA-449, EIA-530, and IRIG-B standards are not currently supported by software.Note
RJ-45 Connector Pinouts
The table below summarizes the pinouts for each serial interface type when using an RJ-45 connector.
Table 28: RJ45 Pinout
IRIG-BRS-485DescriptionDirectionStandard DB-9Pin
NCRxD+ (RS485)Ready to sendInputRTS1
NCRxD- (RS485)DTRInputDTR2
NCNCTransmitInputTxD3
Cisco ASR 903 Aggregation Services Router Hardware Installation Guide
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Troubleshooting
DB-9 Connector Pinouts

Cisco ASR 903 Specifications

General

Brand	Cisco
Model	ASR 903
Category	Network Router
Language	English